OLED Pixel Driving Circuit Stabilizing Gate Voltage Against Flicker
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Low-frequency driving pixel circuits in OLED displays suffer from flickering issues due to leakage currents, which degrade display quality.
Innovation Solution
A pixel driving circuit with a data writing sub-circuit and a light-emitting control sub-circuit that applies data signals to a leakage current compensation point, compensating the voltage of the driving sub-circuit's control electrode during the light-emitting phase, thereby stabilizing the gate voltage of the driving transistor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pixel driving circuit is used in low-frequency OLED display, then the circuit structure is simple, but flickering occurs due to leakage current and display quality deteriorates
Solution Approach 1:
The pixel driving circuit is divided into multiple functional sub-circuits: a data writing sub-circuit for writing data signals, a leakage current compensation sub-circuit for compensating leakage current, and a light-emitting control sub-circuit for controlling light emission. This segmentation allows each sub-circuit to perform its specific function efficiently, resolving the contradiction between improved reliability and reduced complexity.
Solution Approach 2:
A leakage current compensation point is introduced as an intermediary element between the data writing sub-circuit and the driving sub-circuit. This compensation point receives the data signal and applies it to compensate for leakage current effects, thereby improving display quality without significantly increasing overall circuit complexity.
2Reliability
If data signal is applied to leakage current compensation point, then leakage current effect is minimized and flicker is reduced, but circuit complexity increases
Solution Approach 1:
The data writing sub-circuit and leakage current compensation sub-circuit are merged into a unified structure where the data signal path simultaneously serves both data writing and leakage current compensation functions. This merging reduces the number of separate components while achieving both data storage and leakage compensation, thereby improving reliability without proportionally increasing complexity.
Data Source
AI summary
Provided are a pixel driving circuit (110) and a driving method, a display panel (610) and a display device (900). The pixel driving circuit (110) includes: a driving sub-circuit (111) connected to a light-emitting element (120); a data writing sub-circuit (112) configured to write a data signal from the data signal terminal (Vdata) into the driving sub-circuit (111) and apply the data signal to a leakage current compensation point (M), under control of the scanning signal terminal (Vscan); and a light-emitting control sub-circuit (113) configured to control the driving sub-circuit (111) to output a driving current related to the data signal to the light-emitting element (120) under control of the light-emitting control signal terminal (EM). In a process of emitting light by the light-emitting element (120), a voltage of a control electrode of the driving sub-circuit (113) is compensated by a voltage of the leakage current compensation point (M).